Custom activity charts

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I need to add support for custom longitudinal charts for that. However you can get at the athletes current MMP power curves and so on from a custom activity chart. See ActivityJsData.

Example pulling the athletes MMP power curve for the last 42 days (from activity date) and extracting best 5m power:

let mmp42d = icu.bestPower['42d']
let best5mWatts = mmp42d.getWatts(5 * 60)